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Re: History/Evolution of PTO
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Posted by Nolan on June 27, 2001 at 06:51:36 from (209.48.190.220):
In Reply to: History/Evolution of PTO posted by Nazry Jaafar on June 26, 2001 at 13:18:18:
I think you're focusing in too narrowly to find the real answer. A power take off (pto) has existed for centuries in various configurations. You had dogs running in circular cages for rotational force (called spit runners I believe) around something like the 1600's. Horses harnessed to shafts that they would rotate go back even further. These are both very old pto's. Tractors and the earlier steam threshers all had pto's. That was their purpose, to provide remote power. Most of these were belt types due to the availability of leather belts, and the difficulties with the machining and metalurgy of shafts at the time. Leather belts were state of the art for the time. Even the electric clutch actuated pto (presuming that's what you mean by electromechanical pto)has applications far outside of tractors. The clutch used on an automotive air compressor is an example of this type of pto. And at that, it's a secondary pto, with the primary being the belt that spins it. Perhaps what you are seeking is the standardized agricultural pto shaft sticking out the back of tractors? Its history and evolution?
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